JPH01144342A - Cooling device for multiple-stator induction motor - Google Patents

Abstract

PURPOSE:To cool a resisting material effectively, by providing multiple openings to a motor frame to communicate to a funnel and by attaching drafts to these multiple openings. CONSTITUTION:A funnel is provided which communicates to both ends 10 and 11 of a rotor 8 to rotor cores 2 and 3 and a non-magnetic core 9. The non- magnetic core 9 is equipped with multiple cooling action substances 13. A space section 66 is formed to a funnel 67 composed of a pivoting stator 31 installed between stator cores 2 and 3 and a plain bearing 26, a stator 25 secured to a ventilation securing ring 27B and the motor frame 14. The openings formed to the motor frame 14 are communicated to the funnel 67. These openings are to be blowing ports 68 and exhausting ports 69. A motor 72 journalled to a windmill 71 is installed to a blowing barrel 70 to form a draft 73.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an electric motor with improved starting performance. The plurality of conductors provided are short-circuited via the resistive material, and the resistive material, rotor, or stator is ventilated by a blower to cool and radiate heat, and the resistive material 2
This invention relates to a cooling device for improving the durability of a rotor or stator or for increasing starting torque.

[Prior art and its problems]

Conventionally, when starting a commonly used squirrel cage induction motor, star-delta starting, reactor starting, starting compensator starting, etc. are known as means for controlling the starting current. However, although the starting current can be suppressed, the starting torque cannot be increased. In addition, in wire-wound motors, it is possible to improve the starting torque by changing the resistance value of the secondary resistor, but this requires the use of brushes and slip rings, which poses a problem in maintainability.

Furthermore, the technology disclosed in Japanese Patent Application Laid-Open No. 54-29005 has two sets of stators each having independent stator windings facing two sets of rotor cores installed on the same axis. and a squirrel-cage conductor that is commonly installed across the two sets of rotor cores and short-circuited at both ends via short-circuit rings, and a central location of the squirrel-cage conductor between the two sets of rotor cores. A high resistance element short-circuits the squirrel-cage conductors, and windings are provided on each independent stator facing the rotor core, and the phase between the stator windings is set to 1 during startup.
This is a twin core squirrel-cage type motor that supplies power with a 180 degree shift in phase between the stator windings during start-up and in phase with each other during operation after startup. This feature improves starting characteristics, and during operation, the phases of the stator windings are aligned with each other, allowing operation with normal torque characteristics. Therefore, even if the effect of slightly improving startability is recognized,
Durability was significantly reduced due to the heat generated by the high-resistance material, and it was impossible to obtain a large starting torque.

[Purpose of the invention]

The present invention is intended to improve the drawbacks of the above-mentioned prior art,
This makes it possible to efficiently ventilate heat through the resistance material, which is made by short-circuiting a plurality of conductors installed on the rotor, and efficiently dissipate heat, making it possible to obtain a large starting torque.
An object of the present invention is to provide a cooling device that significantly improves the durability of a stator.

The variable speed induction motor of the present invention is used by being connected to a single-phase or three-phase power supply, and the rotor has a normal squirrel cage type, a double squirrel cage type, or a deep groove cage type.

It can be applied to any type of special squirrel-cage rotor core, etc., and the conductors used in the explanation of the present invention refer to conductors installed in the squirrel-cage rotor core and conductors wound around the wound rotor core. It is a general term for each of the windings installed in the winding, and connecting the plurality of stators in parallel to the power supply, or connecting the plurality of stators in series can be arbitrarily selected. It can be adopted by

[Means for solving problems]

In order to achieve the above-mentioned technical problem, the present invention connects each of a plurality of conductors installed in each of a plurality of rotor cores that are attached to the same rotating shaft at arbitrary intervals, thereby forming an integral structure. The plurality of conductors are short-circuited and connected by a resistive material between the plurality of rotor cores installed in each of the rotor cores, and the plurality of conductors are connected concentrically with the plurality of rotor cores. , a plurality of stators are arranged in parallel on the outer periphery thereof, and a voltage phase shift device is installed on at least one stator among the plurality of stators installed on the inner periphery of the machine frame. In the electric VJ machine, a voltage phase setter for setting a starting phase difference and an operating phase difference is connected to the voltage phase shifter, and a A space formed by the machine frame is formed in a ventilation trunk,
A ventilation port is provided in the machine frame and communicates with the ventilation shell, so that the introduced outside air cools the resistance material, radiates heat, and exhausts the heat to the outside of the machine frame. A means for solving the above-mentioned problems is provided by opening air vents and communicating the plurality of openings with a blower device either to an arbitrary number of air blowing ports or to the air exhaust ports.

[For production]

The present invention relates to short-circuiting a plurality of conductors installed in a plurality of rotor cores via a resistive material between the rotor cores, and at least one stator among a plurality of stators. With the voltage phase shift device provided in
At the time of starting, the phase difference is increased to increase the action of the resistance material and the starting torque is increased, and during operation, the phase difference is decreased or made into a gap to reduce the action of the resistance material or to zero. Made it rotate at high speed.

Furthermore, in order to improve the durability of the resistance material itself, the rotor, the stator, etc. due to the heat generated by the resistance material during startup, in the present invention, between the plurality of stators, between the rotor core, and the A space formed by the machine frame is formed in the ventilation shell, and the air is communicated with either the ventilation port or the ventilation port so that the introduced outside air cools the resistance material, radiates heat, and exhausts the air outside the machine frame. Since ventilation is provided by the device, it is possible to extremely effectively cool and dissipate heat from the resistive material and its surroundings, which has a remarkable effect in improving durability and securing a large starting torque.

〔Example〕

Embodiments of the present invention will be described based on FIGS. 1 to 22.

A first embodiment of the present invention will be explained with reference to FIGS. 1 to 3.

Reference numeral 1 shown in FIG. 1 is a multiple stator induction motor according to the present invention, and the induction motor 1 has the following configuration. Rotor cores 2 and 3 made of iron cores are mounted on a rotor shaft 4 with an arbitrary interval, and an insulating non-magnetic core 9 is interposed between the rotor cores 2 and 3. In the non-magnetic core 9 portion between the rotor cores 2.3, the non-magnetic core 9 is made of heat-resistant material such as asbestos or ceramic material (pottery).

(including non-magnetic new ceramics, etc.).
It may be formed integrally by surrounding it, or it may be formed with an opening at a suitable location. Each of the plurality of conductors 5 installed in the rotor cores 2 and 3 is connected in series to form an integral rotor 8, and the plurality of conductors 5 connected in series are connected in series. Both ends are connected by short-circuit rings 6 and 7. In addition, a plurality of ventilation cylinders 12 are connected to the rotor cores 2 and 3 and the non-magnetic core 9 to both sides 1o and ii of the rotor 8.
Establish... A plurality of conductors 5 installed on the rotor 8...
- is a nichrome wire or carbon-containing steel that serves as a connecting material for each of the plurality of conductors 5 in the non-magnetic core 9 portion between the rotor cores 2 and 3.

They are short-circuited and connected via a resistive material r such as a conductive ceramic, and an insulating coating may be applied to the outer peripheral surface of the conductor 5 or the resistive material r. The non-magnetic core 9 is made of aluminum material with an insulating coating.
A plurality of cooling bodies 13 made of non-magnetic material such as stainless steel, T7 lamic material, resin, rubber, glass, etc. are installed,
The cooling effect body 13 is formed on the cooling blade vehicle body 13A. The cooling body 13 can be formed by forming the non-magnetic core 9 into a cooling fan using the above-mentioned arbitrary non-magnetic material, or by forming the cooling body 13 into various shapes.
A plurality of optional cooling elements may be attached to one or both inner surfaces of the rotor core 2.3, and a cooling body of any type may be attached to the rotor shaft 4 in the space of the rotor cores 2 and 3. A plurality of resistive materials r... are used as a cooling agitator in a zigzag shape or any other cooling agitation body 1.
3, and the resistive material r... is optionally made of the above-mentioned non-magnetic material to form a cooling stirring body 13 of various shapes.
It is desirable that these cooling elements 13 be treated with an insulating coach ink. Incidentally, one or both sides of the rotor core 2.3 may be provided with insulation treatment such as asbestos, ceramic material, etc., which is a heat-resistant material, on the inner surface thereof. Bearing discs 15 and 16 provided on both sides of a cylindrical machine frame 14 are connected to a connecting rod 1 with bolts at both ends.
Assemble integrally with 7... and nut 18...
Cooling devices 1119.20 are installed on both sides of the rotor 8,
Both ends of the rotor shaft 4 are supported by bearings 21, 21 fitted in bearing discs 15 and 16, so that the rotor 4 can freely rotate.

A winding 2 is concentrically arranged on the outer side of the rotor core 2, 3.
The rotating stator 31 and the second stator 25 subjected to 2.23 are arranged facing each other in parallel, and a sliding bearing 26 is installed between the machine frame 14 and the rotating stator 31, and the sliding bearing 26 is installed between the machine frame 14 and the rotating stator 31. The left and right movement is fixed by the stop ring 28 fitted in 14,
(See FIGS. 1 and 2) The machine frame 14 and the second stator 25 are fixed by a ventilation fixing ring 27A and a fixing ring 27B, which are provided with ventilation windows at several locations. A gear 33 is fitted on the outer peripheral surface of one side of the rotary stator 31, and a small motor 3 for forward and reverse rotation is formed with a drive device 29 fixed to the outer peripheral part of the machine frame 14.
A driving gear 36 is pivotally attached to the bearing board 15.1, and a plurality of exhaust ports 39A and 39B are bored in the outer periphery of the clear frame 14.
6 is provided with a plurality of ventilation holes 40....

A space 66 is formed between the rotor cores 2 and 3, the rotating stator 31 mounted on the sliding bearing 26, the second stator 259 fixed to the ventilation fixing ring 27A and the fixing ring 27B, and the machine frame 14. A plurality of openings are formed in the ventilation shell 67 and communicated with the ventilation shell 67 by opening a plurality of openings in the machine frame 14, and the plurality of openings are formed into an arbitrary number of ventilation ports 68 and ventilation ports 69. . Send the motor 72 attached to the windmill 71 INIW
470 to form the blower device 73, and the motor 72
A control mechanism 106 is connected thereto, which is formed to be able to freely rotate in forward and reverse directions and is provided with an ON/OFF switch, a voltage regulator, an inverter, or any other speed change means. The blower device 73 is fixed to the machine frame 14, and the air suction portion 74 of the blower device 73 is fixed to the machine frame 14.
A is connected to the ventilation port 69 to communicate with the ventilation barrel 67, and the ventilation port 68 introduces outside air from the other side of the ventilation port 69.
The ventilation section 74B is connected to the ventilation section 13i70.

The driving gear 36 partially inserted into the machine frame 14 through the opening 37 is engaged with the gear 33 fitted to the rotating stator 31, and a small motor 35 equipped with a switch and forming the driving device 29 is connected. A second stator 25 is connected to the rotating stator 31 via a rotating mechanism 30 consisting of a gear 33 and a drive gear 36 so that the rotating stator 31 can freely rotate, and is fixed to the machine frame 14. A rotary stator 31 is provided in the voltage phase shifter 100 and is rotatable in relation to the voltage phase shifter 100 .

Note that the small motor 35 is a pulse motor.

Any device such as a servo motor may be used, and instead of the gear 33, an air cylinder or a hydraulic cylinder may be used as the rotating means for the rotating stator 31.

Rotation mechanisms such as electromagnets can be selected and adopted.

A magnetic sensor 32 is attached to the outer peripheral surface of the rotating stator 31,
A plurality of magnetic detectors 34 with different terminal diameters for detecting magnetism in relation to the magnetic sensor 32 are embedded in a non-magnetic plate 41, and the non-magnetic plate 41 is attached to the inner peripheral surface of the machine frame 14. A voltage phase difference detector 42 is formed by the magnetic sensor 32 and the magnetic sensing body 34 .゛It is connected to a voltage phase difference setting device 105 consisting of a plurality of switches for setting the voltage phase difference position, and the voltage phase difference detector 105 is electrically connected to a display 43 that digitally displays the voltage phase difference. . Reference numeral 38 denotes a solenoid for controlling the dispatch of a man. A speed detector 44 such as a tacho generator is mounted on the child shaft 4, and the speed detector 44 is connected to a speed indicator 45. Note that the speed detector 44 is not limited to being mounted on the rotor shaft 4, and may be mounted on the rotor cores 2, 3, non-magnetic tachometers, etc., such as a strobe type tachometer or a photoelectric tachometer. body core 9, conductor 5
It may be installed and used in connection with ... etc.

What is shown in FIG. 3 is a rotating stator 31. Second stator 25
It is a wiring diagram of the winding wound on the rotary stator 31. Second
A winding 22 in which each of the stators 25 is star-connected.
23 are connected in series. That is, the terminals A, B, and C of the winding 22 of the rotary stator 31 are connected to the commercial three-phase power source A, B, and C, and the terminals a, b, and c of the winding 22 are connected to the second stator 2.
The terminals A, B, and C of the winding 23 of No. 5 are connected, and the terminals a, b, and c of the winding 23 are short-circuited and connected.

The operation of the above configuration will be explained below.

When the windings 22.23 are energized from a commercial three-phase power source, a rotating magnetic field is generated in the rotating stator 31.25, voltage is induced in the rotor 8, and current flows through the conductors 5 of the rotor 8. The rotor 8 rotates. The second stator 25 with respect to the rotating stator 31
When the amount of rotation of each is set to zero, there is no phase shift in the magnetic flux of the rotating magnetic field generated in each stator 31.25, and as will be described in detail later, the resistance material r.
Since no current flows through the motor, it has the same torque characteristics as a general induction motor.

Next, a case will be described in which the small motor 35 is operated to rotate the rotary stator 31, and the rotary stator 31 is rotated by an electrical phase angle of θ. Rotating stator 31 and second stator 2
The magnetic flux φ1 of the rotating magnetic field created by 5. The phase of φ2 is shifted by θ, and therefore the voltage 6+ induced in the conductor 5 of the rotor 8 by the rotating stator 31 and the second stator 25 and the phase of white are shifted by θ. Now, the voltage ω induced in the conductor 5 of the rotor 8 by the second stator 25 is taken as a reference, and this voltage is set as ω-8E. Here S is slipping, E
is the induced voltage when the slip is 1. At this time, the voltage d1 induced in the conductor 5A by the first stator 24 is!
+-8EεJO.

(E = induced voltage when slip is 1) What is shown in Fig. 4 is the case where the resistance material r... that short-circuits the plurality of conductors 5... is not installed in the non-magnetic core 9 section. This shows the relationship between the slip S of the rotor 8 and the active power P input to the rotor. When the voltage phase is θ = 0'', the active power P is maximum, and when 0° < θ < 180°, it is Here, if the resistance and inductance of the conductor 5 are R and L, and the angular frequency of the power source is ω, then the maximum active power P is S = (R/
It appears when ωL).

Since the active power P is proportional to the driving torque of the induction motor 1, the voltage induced in the rotor 8 is adjusted by operating the small motor 35 and rotating the rotary stator 31 relative to the second stator 25. However, the speed of the rotor can be controlled steplessly.

Next, the resistances of the conductors 5 of the rotor 8 from the short-circuit rings 6.7 to the connecting members are R+ and R2, the inductances are Ll and L2, the angular frequency of the power source is ω, and each conductor 5 . . , the electrical equivalent circuit of the rotor 8 is as shown in FIG. 6, with symbols I+, 12, . I3 indicates the current flowing through each branch.

Next, when converting the circuit shown in Fig. 5 into an equivalent circuit seen from both stators 31 and 25 side, it becomes as shown in Fig. 6, and R+-R
2, L+-L2 and θ=O.

When , I'3-1t-I2=O, and no current flows through the resistive material r. This means that when θ=0'', the torque T is equal to the value without r. Therefore, when θ-〇°, it has the same torque characteristics as a conventional induction motor. .

Next, RI = R2,, -L I = L2 and θ-180
°, I+=-I2. I3-It-I2-2■
1, and if the resistance of the rotor conductor is RI=R2-R in a conventional induction motor, the result is similar to that of increasing R to R+2r.

As the rotor 8 rotates, outside air is sucked into the machine frame 14 by the cooling impellers 19 and 20 through the ventilation holes 40 bored in the bearing discs 15 and 16, and the cooling impellers 19 draw the outside air into the machine frame 14. 2
29 rotor core 2. The conductor 5... etc. are cooled and the exhaust hole 3
9A... to the outside of the machine frame 14, and the cooling impeller 2
0, the surplus air sucked by the impeller 19 flows into the ventilation barrel 12 . The air is combined with the winding 23. The second stator 25 is ventilated and cooled, and the exhaust air is discharged from the ventilation holes 39B of the machine frame 14 through the ventilation window of the ventilation fixed link 27A, and the windings 22, 23, the rotor core 2 , 3. Non-magnetic material 9.
A function is stably exerted on each of the conductors 5...

Next, FIG.
This will be explained with reference to FIG.

Since the windings 22 and 23 are connected in series, current flows between the windings 22 and 23 from the commercial three-phase power supply.
．． 23 or re-stator 31.
25, the magnitude of the current flowing through each winding 22, 23 is the same regardless of the difference in the magnitude of the capacitance of the rotary stator 31 and the second stator 25. The magnitude of the current induced in the conductor 5 of the child 8 becomes equal, and the rotating stator 31... The magnitude of the current flowing from each of the stators 31 and 25 to the conductor 5 of the rotor 8 becomes equal depending on the rotation difference with respect to the second stator 25, that is, the phase shift that occurs in the magnetic flux of the rotating magnetic field. The effect of generating a forcing force, and the re-stator 31.
A force is generated in that the vector difference current caused by the phase difference between the voltages between the conductors 5 inevitably flows through the resistive material r that connects each of the plurality of conductors 5. As shown in the slip and torque characteristics shown in Figure 7, the synergistic effect between the two speed ranges makes it possible to improve efficiency and generate large torque in each speed range. It is easy to use, and can be used to suit the starting characteristics of the load to provide a clean start, or to start with high output, making it ideal for power sources that repeatedly start and stop. . As mentioned above, the speed of the rotor 8 is controlled by controlling the phase shift by the rotary stator 31, and the conductor 5 of the rotor 8...
・The rotor 8 is controlled only by increasing or decreasing the current flowing through the rotor 8.
The rotation speed can be changed arbitrarily.

Note that the rotating stator 31 has windings 22 and 23 connected in series.
and the second stator 25 to the conductor 5 of the rotor 8, respectively.
・For the magnitude of the current flowing in ・, multiple conductors 5...
The ratio of the current that flows in a short circuit through the resistive material r... is determined by the value of Pθ (P=ffl logarithm, θ - phase angle), regardless of the resistance value and slip of the resistive material r... (The above ratio is the maximum for Pθ-π and becomes zero at Pθ=O.) If Pθ is constant, the same slip as when the secondary insertion resistance of a general wound induction motor is constant. When the torque characteristic becomes small and Pθ becomes small, the conductor 5 of the rotor 8...
The ratio of the current flowing through the motor becomes small, and reducing Pθ has the same effect as reducing the secondary insertion resistance of a general wound induction motor. When the rated current is passed through the stators 31 and 25 again, the phase difference θ
Even if the rated current and rated torque characteristics of the maximum speed are changed arbitrarily, depending on the selection of the slip value and the design of the resistance value of the connecting member, the rated current and rated torque characteristics of the maximum speed can be made to act almost equally in each speed change range.

In addition, the windings 22.2 of the rotary stator 31 and the second stator 25
3 are connected in series, if a connecting material is provided between the conductors 5 and there is no short circuit, almost no current will flow through the rotor conductors 5 when there is a phase difference. This results in a phenomenon in which efficiency and torque are significantly lower than those in which the windings 22, 23 of the re-stator 31, 25 are connected to the power source in parallel.

In contrast to the above, the winding 2 of the rotary stator 31 and the second stator 25
2.23 are connected in parallel to a commercial three-phase power supply, the windings 22.
23 are equal, the voltages induced from each of the re-stators 31.
The current flowing through the resistive material r... which serves as a connecting material between... is (1/2) Resistance material r・
The current is approximately proportional to the resistance value of... However, in addition to the current flowing through the resistor material r... in the conductor 5 of the rotor 8, it is approximately proportional to (sum voltage induced in the rotor conductor of the stator) ÷ impedance of the rotor conductor). The currents flow in a superimposed manner. (The above sum voltage is maximum when Pθ=π is zero and Pθ=0, and the impedance of the rotor conductor is composed of the resistance of the conductor and the secondary leakage reactance, respectively, so it varies depending on the slippage.) Therefore, the rotor 8
The ratio of the current flowing between the plurality of conductors 5 through the resistive material r to the magnitude of the current flowing through the conductor 5 is determined by the slip and resistance value even if Pθ is constant. Differently, the slip and torque characteristics when Pθ is constant are the same as those when the secondary insertion resistance of a general winding induction electric rock is constant, and the characteristics when the primary voltage of a general induction motor is controlled. As shown in FIG. 9, this characteristic is a mixture of the windings 22 and 23 of the stator 31 and 25.
The range of speed control becomes narrower than the characteristic when connected in series.

Next, operation preparations and operations during operation will be explained based on FIGS. 1 and 2.

Before starting operation, the magnetic detector 34
When the magnetic sensor 32 detects the rotating position of the rotary stator 31, and the magnetic sensor 32 displays the detected value on the display 43, for example, the operating phase difference 0° of the magnetic detector 34a. If the starting switch is pressed in this state, a large current may flow and damage the starting switch, or if the motor requires a large starting torque, the motor 1 may be unable to start. Therefore, the solenoid 38 is activated to shift gear 3.
3, the small motor 35 is reversely rotated to rotate the rotary stator 31, and the starting phase difference 1800 set in the voltage phase difference setting device 105 is set to the magnetic detector 3.
4g, the magnetic sensor 32 detects it and the display 43
When the starting phase difference of 180° is displayed, the operation of the small motor 35 is stopped, and the solenoid 38 is actuated to engage the gear 33 and lock the rotary stator 31.

When the above operation preparation operation is completed, the start switch is turned on and the windings 22 and 23 are energized, and the rotor 4 rotates with a large starting torque. Next, the solenoid 38 is activated to unlock the gear 33 provided on the rotary stator 31, and the small motor 35 is rotated in the forward direction to rotate the rotary stator 31, and the voltage phase difference setting device 105 is set. When the magnetic sensor 32 detects the operating phase difference 0° from the magnetic detection body 34a and displays the detection signal on the display 43 as the operating phase difference 0°, the rotation of the small motor 35 is stopped and the solenoid 38 The gear 33 is locked and the rotor 4
Normal operation of the load connected to the system will continue.

In the above, it has only been explained that the starting phase difference set in the voltage phase difference setting device 103 is 180°, and the operating phase difference is set to Oo during operation, but the starting phase difference is not limited to the above embodiment. Sometimes the starting phase difference is 1
It is possible to set the rotation speed (load rotation speed) of the rotor 4 to an arbitrary value such as 30 degrees, ``Go'', etc. using the voltage phase difference setting device 105 to set the operating phase difference during operation. Naturally, depending on the starting torque characteristics of the load, the starting phase difference at the time of starting, for example, 150°,
It can be set arbitrarily, such as 120 degrees, and in these cases, the time required to normalize the operation may be shorter than when the starting phase difference is started from 180''.

In addition, each characteristic at the time of startup or operation of the electric motor 1 is such that the resistance value provided to the resistance material can be arbitrarily designed, and the resistance material shown in FIG. 10 is set to a high resistance material, and the resistance material shown in FIG. This shows the characteristics of a low resistance material, and it can be determined that the resistance material should be selected to be high or low depending on the characteristics of the load connected to the rotor 4.

After operating according to the target voltage phase difference set value, the control mechanism 106
The motor 72 of the blower 73 is operated by the windmill 71.
When the windmill 71 rotates, outside air is sucked through the air outlet 68 and into the IIM 67 by the wind turbine 71, and the outside air is stirred inside the Jill 167 by the cooling member 13, and the non-magnetic core 9 or the conductor 5... , the resistance material r, etc., and the air inside the ventilation cylinder 67 is sucked into the ventilation cylinder 70 through the ventilation port 69 and is blown from the ventilation port 74B.
Exhausted outside.

In high-speed operation due to the setting of the operating phase difference, the ventilation action of the cooling impeller 19.20 that sucks outside air is
12-... to cool the rotor core 2.3 and non-magnetic core 9, and conductor 5....

It exerts a heat dissipation effect on the resistance material r... and the exhaust air is discharged 1
Since the heat is discharged from each of 139A..., 39B..., the heat generated by the resistance material r... does not become very high and no heat is stored. In such a case, it is not necessarily necessary to rotate the windmill at a constant speed, and the control mechanism 106 may control the motor 72 of the blower device to ON-OFF to intermittently operate the ventilation action of the windmill 71, or rotate it at a low speed as necessary. Power saving is promoted without the above ventilation.

However, at startup or during low/medium speed operation, the heat generated by the resistance material r... increases rapidly.
When the cooling impeller 19.20 blows air only, the resistance material r...
In this case, the control mechanism 106 causes the motor 72 of the blower to continuously blow air at ONL or rotate at high speed, and introduces outside air into the blower cylinder 67 to remove the non-magnetic material. Since the core 9 and the resistance material r... are provided with a blower device 73 that cools and radiates heat and exhausts the waste heat through the ventilation 1167, the resistance material r... is cooled and heat radiated regardless of the rotational speed of the motor 10. , Na rotational efficiency effectively acts, and maintains improved durability by preventing deterioration and oxidation of the mechanical strength of each of the heat generation and the resistance material r involved in the heat generation, and the non-magnetic core 9. can do.

Note that the air exhaust port 74B of the air blower 73 is communicated with an arbitrary number of air outlets 68 provided in the machine frame 14, and outside air is introduced into the ff1lli 67 by the air blown by the air blower 73, and the exhaust air is passed through the arbitrary number of air outlets 68. 69 may be excluded. In any case, since the outside air is introduced into the ventilation shell 73 from one side of the machine frame 14 and the exhaust air is exhausted from the other side of the machine frame 14, the resistance material r... and the non-magnetic core 9 are cooled. The air outlet 68. can have an effective effect on heat radiation.
There may be a plurality of exhaust ports 69.

In addition, as shown in FIG. 9, a pump 102 is installed in the water tank 101.
A refrigerant device 104 formed by a radiator 103 connected via a radiator 103 is connected to the ventilation port 68, and cools the air introduced into the ventilation cylinder 67 to cool the air introduced into the ventilation cylinder 67. Cooling heat radiation to the resistance material r... is made more effective. Although not shown, the refrigerant device 104 includes a cooler, a condenser, and a refrigerant gas.

The configuration using various other refrigerant devices can be arbitrarily selected and implemented. Note that the blower device 73 and other refrigerant devices 104 may optionally be arranged elsewhere and communicated with the blower port 68 or the blower outlet 69 via a duct without being directly connected to the machine frame 14. There are things you can choose to implement.

In the above, the rotating stator 31 with respect to the second stator 25
Although a configuration has been described in which the voltage phase shifter RA100 is rotatably formed in the voltage phase shifter 100, the voltage phase shifter RA100 is not limited to the above configuration, and may be formed by various means shown below. You can choose and implement it as you like.

First, a winding in which the first stator 119° and the second stator 25 are wound will be explained based on FIG.

First stator 119. Each of the windings 117 and 118 wound around each of the second stator 25 is connected in delta, terminals U, V, and W of the winding 117 are connected to a commercial three-phase power supply, and the other terminal of the winding 117 is , V, X changeover switch M1 to M4
The terminals U-7 of the winding 118 are connected to the respective terminals of the winding 118 of the second stator 25 via the changeover switches N1 to N4.
It is connected to a commercial 3-phase power supply via.

The voltage phase shifter 100 is formed by changeover switches M1 to M4 and N1 to N4, and changeover switches M1 to M4. Nl~
Each of N4 is a pushbutton switch 107A to 107.
D, and display lamps 108A to 1080 that digitally display the set values of the starting phase difference and the operating phase difference.

The first stator 119 and the second stator 25 are each fixed to the machine frame 14.

Next, the operation of the above configuration will be explained.

When starting the electric motor 1, press the push button switch 1070 of the voltage phase difference setting device 120 to set the starting phase difference to 18
When set to 0°, the signal causes a starting phase difference of 180°.
° is displayed on the display lamp 108D, and at the same time, the selector switch M4. When N4 is ONL, the windings 117 and 118 are energized, and the starting phase difference between the windings 117 and 118 at startup is 180 degrees, and the rotor 4 is operated at a large output without passing a large current to the changeover switches Ma and Na. When the pushbutton switch 107A is pressed after an arbitrary time has elapsed, the changeover switches M4 and N4 are turned OFF and at the same time the changeover switches M+ and N+ are turned ON, and the phase difference for operation is 0°.
is displayed on the display lamp 108A, and the current flowing through the windings 117 and 118 has the same torque characteristics as a general induction motor.

Further, depending on the starting characteristics of the load connected to the rotating shaft 4, the starting phase difference at the time of starting can be set using an arbitrary push button switch 1070.
107B, and selector switch M3. M2 and changeover switch N3. By appropriately switching to N2 and performing the startup operation, it is possible to shorten the time required from startup to normal operation.

Next, other means of the voltage phase shifting device will be explained with reference to FIG. The output side of the winding 112 wound around the stator 110 is connected to a power source, and the output side of the winding 112 is connected to a single-phase transformer 114.
and a plurality of connection changeover switches P1 to P4 are formed in the voltage phase shifter 100, and the single phase transformer 114 of the voltage phase shifter 1oO and the connection changeover switches P1 to P4 are connected to the stator 11.
The winding 112 and the winding 113 are connected in series.

Further, each of the connection changeover switches P1 to P4 is a voltage phase difference setting device 11 comprising a push button switch for setting a starting phase difference and an operation phase difference and a plurality of display lamps.
5 are electrically connected.

In this embodiment, the only difference is that the connection changeover switches P2 and P4 connect the windings 112 and 113 via a single-phase transformer 115, and that the windings 112 and 113 are star-connected. The operation performed by the voltage phase difference setter 115 during startup and operation is the same as the operation described in FIG. 12, so the details thereof will be omitted.

Moreover, the rotating stator 31. The second stator 25 or the first stator
Stator 119. Each of the second stators 25 is provided with a winding for changing the number of poles of a plurality of types, and a changeover switch shown in FIGS. 12 and 13 is connected to the terminal of each winding, and a voltage phase difference setting device is also connected to the terminal of each winding. The object of the present invention can be achieved even if the device is attached.

Next, a description will be given based on a side view of the main parts shown in FIG. 14 and a cutaway view of FIG. 15.

A plurality of resistive materials r... are short-circuited to a plurality of conductors 5... communicating between the rotor cores 2 and 3, and the plurality of resistive materials r... are, for example, highly heat resistant, Insulating ceramics (including pottery, new ceramics, etc.), stainless steel, resin, and rubber.

A core 84 for resistive material is surrounded by glass, asbestos, aluminum with an insulating coating, and other non-magnetic materials.
The resistive material core 84 may be provided with an opening fi84A as shown by the broken line in the right half, and the resistive material core 84 is mounted on the rotor shaft 4.

With the above configuration, even if heat is generated in the conductor 5... or the resistance material r... while the plurality of conductors 5... or the plurality of resistance materials r... are being energized, the resistance material r... ...
is not deformed by the resistive material core 84, ensuring mechanical strength, and since the resistive material core 84 is insulating, it does not induce magnetism, making it possible to prevent a decrease in torque due to leakage reactance.

In addition, since the resistive material r... is surrounded by the resistive material core 84, oxidation caused by heat generation can be prevented and the durability of the resistive material r... can be improved. Also, through J
The ventilation effect of the air blower 73 introduced into the iI 67 is as follows:
Cooling and heat dissipation of the conductors 5 . . . and the resistive material r . . . is effectively promoted by the rotation of the resistive material core 84A. Note that the resistive material core 84 can be divided into a plurality of arbitrary parts and mounted on the rotor shaft 4.

Next, the conductor core surrounded by the conductor 5 will be explained based on the side view of the main part shown in FIG. 16 and the cutaway view of FIG. 17.

A plurality of conductors 5... communicated between the rotor cores 2 and 3, and a plurality of resistors [r...
Each of the conductor cores 85 is surrounded by any heat-resistant and insulating non-magnetic material. A corpus luteum 8 serving as a plurality of cooling bodies is provided on the outer peripheral surface of the conductor core 85.
5A... is provided, and the conductor core 85 is connected to a plurality of arms 8.
5B... is attached to the rotor shaft 4, and the arm 85B...
... is formed in the opening window 85C. In this embodiment, the deformation of the conductors 5 during operation can be prevented from damaging the windings 22, 23 by the conductor core 85, and the blades 85A, which rotate with the rotation of the rotor shaft 4, can prevent damage to the windings 22, 23. , the conductor 5 comes into contact with the air introduced into the ventilation shell 67,
This is effective for the cooling heat dissipation effect of the resistor material r... and for preventing a decrease in torque due to leakage reactance.

Next, still another embodiment of the conductor core will be described based on the side view of the main parts shown in FIG. 18 and the cutaway view shown in FIG. 19. .

The conductor cores 86A, 86B made of an insulating heat-resistant material or any non-magnetic material are surrounded by a plurality of conductors 5..., and the conductor cores 86A, 86B face the rotor core 2.3. The conductor cores 86A, 8 are integrally attached to both sides.
6B is equipped with a plurality of wing pieces 86C serving as cooling bodies.

In this embodiment, the operation is similar to that of the previous embodiment, so the details thereof will be omitted.

What is shown in FIG. 20 is an embodiment diagram in which conductors 5... are formed in a rotor core, and the shallow parts of a plurality of conductors 5... or a plurality of resistance materials r... The rotor core 87 is surrounded by any insulating heat-resistant material or non-magnetic material, and the open conductors 5 and the resistive material r are coated with an insulating coating. is applied. This embodiment is characterized in that the heat dissipation effect of the conductors 5 . . . and the resistive material r . . . is high due to the rotation action of the rotor core 87.

What is shown in FIG. 211 shows that each of the plurality of conductors 5 installed in each of the rotor cores 2.3 and the rotor in the space between the rotor cores 2.3 or in the non-magnetic core part. This is an embodiment in which a high resistance ring 116 fitted into the shaft 4 is short-circuited by a resistance material r serving as a connecting member. Resistance material r・
. . . can obtain the appropriate effect even if they are not connected to all of the conductors 5 .

Next, an embodiment of automatic control of a variable speed induction motor will be described with reference to a block diagram shown in FIG.

(See FIGS. 1' and 2) Input/output control circuit 76, control circuit 77, arithmetic circuit 78. A speed detector 44 such as a tacho generator, which is equipped with a speed indicator 45 mounted on the rotor shaft 4 on the input side of the control device 75 consisting of a memory circuit 79 and the like;
A voltage phase difference detector 42 that detects the rotational position of the rotational stator 31 and a temperature detector 8 attached to the appropriate position of the ventilation 1M467
0, a keyboard 81 equipped with an activation switch 82 and a display, and a voltage phase difference setting device 105 are connected, and a conductor 5... , the resistive material r, etc., and the solenoid 38 is connected to the motor 72 of the blower device 73 for cooling and dissipating heat. From the keyboard 81 to the control device 7
The following control values are input to the storage circuit 79 of No. 5. That is, the set values of the starting phase difference and the operating phase difference set in the voltage phase difference detector 42 that detects the rotational position of the rotational stator 31 corresponding to a phase angle of 0° to 180°, and the above-mentioned phase difference. A speed control value that controls the rotation speed of the motor 72 with respect to a set value of , several types of starting phase difference set values that match the starting characteristics of the load connected to the rotor shaft 4 , and a temperature sensor 80 . A reference temperature setting value is inputted to control the motor 72 to increase or decrease the temperature detected by the controller.

When the operation preparation key is input from the keyboard 81 at the start of operation, the voltage phase difference detector 42 detects the current rotation position of the rotary stator 31 and displays it on the display, and the voltage phase difference setting device 105 indicates the rotation position. When an arbitrary starting phase difference set value that matches the starting characteristics of the load connected to the child shaft 4 is input, the solenoid 38 is actuated in response to a signal output from the memory circuit 79 of the control device 75, and the rotating stator 31 is activated. Unlock the gear 33 fitted to the small motor 3.
5 to rotate the rotary stator 31, and when the voltage phase difference detector 42 detects that the desired starting phase difference position has been reached, the small motor 35 automatically stops.

When ready for operation is displayed on the display, a phase difference setting value for arbitrary operation is input to the control device 75 from the voltage phase difference regulator 105 according to the starting torque of the load connected to the rotor shaft 4, The rotation speed of the small motor 35 is calculated to obtain the phase difference set value. When the start switch 82 is activated and an input signal is sent to the control device @75, the small motor 35 is activated in response to the output signal of the control device 75 to rotate the rotary stator 31, thereby performing the input operation. When the voltage phase difference detector 42 detects the phase difference setting value for the small motor 35
stop. Then, the speed value detected by the speed detector 44 attached to the rotor shaft 4 is compared with the speed control am, and if there is a difference in speed, the control device A5 outputs it to the small motor 35. The rotational speed is corrected and controlled, and the solenoid 38 is operated to lock the rotating stator gear 33.

The control full device 7 corresponds to the starting phase difference setting value or the operating phase difference setting value set in the voltage phase difference setting device 105.
The output signal from 5 controls the rotational speed of the motor 72 to a high side or a low side via a control mechanism 106.

When the temperature detection value of the temperature detector 80 communicated to the control device 75 becomes higher than the reference setting value set in the storage circuit 79, the control mechanism 1 is activated by a signal output from the control device @75.
06, the rotational speed of the motor 72 is corrected, and the ventilation action within the ventilation cylinder 67 is increased to restore the normal function of cooling and dissipating heat from the non-magnetic cores 9, the resistance material r, and the like.

In addition, regardless of the phase difference control of the voltage phase difference setter 105, the blower device 73 is controlled by an output signal from the control device 75 so that the detected value of the temperature detector 80 becomes the reference temperature setting value.
The rotational speed of the motor 72 may be controlled by the control mechanism 106 to increase or decrease, or to turn it on or off.

Furthermore, the multiple stator induction motor of the present application can also be used as an induction generator, and the rotor shaft 4 has a turbine and a gas turbine.

If a solar thermal power generator or the like is directly connected to generate electricity, an expensive governor can be omitted. In addition, when an internal combustion engine is connected as a prime mover, it can correspond to the rotation speed of the internal combustion engine that achieves the minimum fuel consumption, and the rotation speed that can produce the maximum output even in the case of a weak and unstable bottle stand that uses feng shui as an energy source. In hydroelectric power generation, power can be generated efficiently according to the flow velocity, and complicated and expensive variable pitch devices or phase adjusters can be omitted. Furthermore, synchronization with external power can be performed without an expensive synchronization device. Furthermore, if the rotor shaft is connected to another rotary shaft and a switch is provided to switch the two phases on the input side of the stator winding, and the rotor shaft can be freely rotated in forward and reverse directions by the switch, It can also be used as an electric brake by operating a switch and a voltage phase device, and by controlling the rotation speed with the voltage phase device, the braking force of the rotating shaft connected to the rotor shaft can be efficiently adjusted.

What is shown in FIG. 18 is a case in which a plurality of conductors 5 installed in each of the rotor cores 2 and 3 rotate in the space between the rotor cores 2 and 3 or in the 9 parts of the non-magnetic core. This is an embodiment in which a high resistance ring 116 fitted into the child shaft 4 is short-circuited by a resistance material r serving as a connecting member. Resistance material r・
. . . can obtain the appropriate effect even if they are not connected to all of the conductors 5 .

In addition, the cooling body 13 is attached to the non-magnetic core 9 by the cooling blade vehicle body 13.
A, directly attaching the cooling blade vehicle body 13A to the rotor shaft 4, and forming a non-magnetic core 9 by surrounding the conductor r with a heat-resistant material such as asbestos or ceramic material. Sometimes I do.

In addition to the embodiment shown in FIG. 2, the voltage phase difference detector includes one that detects changes in the voltage phase difference value of the rotating stator 31 using a plurality of limit switches, one that detects using a photo sensor, rotary encoder, proximity switch,
It is possible to arbitrarily select and implement a configuration in which a beam sensor, an ultrasonic sensor, a charge sensor, etc. are selected, any one is calculated by the control device, and the voltage phase difference is displayed based on the calculated value.

Also, regarding the embodiments of multiple windings, the configuration in which they are connected in series has been described, but the configuration in which they are connected in parallel is as follows.
The torque at startup is slightly smaller than when connected in series, but since the resistance materials are shortened into multiple I-bodies and connected, if we mainly consider the characteristics of the starting torque, the resistance materials should be A large starting torque can be created depending on the resistance value.

Even if the stator is formed into a wound shape instead of a squirrel cage stator, the same function as that obtained by connecting the resistance materials described above can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of conductors are installed in each of a plurality of rotor cores, and the plurality of conductors are short-circuited and connected between the plurality of rotor cores using a resistive material. In an electric motor having a configuration in which a voltage phase shift device is provided in relation to at least one stator among a plurality of stators, the voltage phase difference that sets a starting phase difference and an operating phase difference. A setting device is connected to a voltage phase device, outside air is introduced into the ventilation barrel in the space between the plurality of rotor cores, and either one or both of the plurality of conductors or the resistance material is blown by a blower. Since cooling and heat are radiated directly or indirectly through ventilation, deterioration of mechanical strength and oxidation caused by heat generation of the conductor and resistive material are prevented, and durability is significantly improved. In addition, the resistance material can increase the torque at the time of starting, which is extremely effective in making the starting equipment at the time of starting small and simple, making it easy to operate.

[Brief explanation of the drawing]

1 to 22 are illustrations of embodiments of the present application. Fig. 1 is a side sectional view of the induction motor, Fig. 2 is a side view showing the rotation mechanism of the rotating stator and the blower, and Fig. 3 is a side view showing the rotation mechanism of the rotating stator and the air blower. Figure 4 is a diagram showing the relationship between rotor slip and active power, Figure 5 is an electrical equivalent circuit diagram of the rotor, Figure 6 is an electrical equivalent circuit diagram seen from the stator side, Figure 7 is a diagram showing the relationship between speed and torque when a plurality of conductors are short-circuited using resistive materials and the windings wound around the stator are connected in series, and Figure 8 is a diagram showing the relationship between the windings of the stator. A diagram showing the relationship between speed and slip when each is connected to a power source in parallel, Figure 9 is a side view of the radiator connected to the ventilation barrel, Figure 10 is a high resistance material, and Figure 11 is a resistance material with high resistance. Figure 12 is a diagram showing the characteristics when the material is formed to have a low resistance. Figure 12 is a configuration diagram in which a voltage phase difference setting device is connected to the stator winding in a phase shift changeover switch instead of a voltage phase shifter. Figure 13 14 and 15 are diagrams showing an embodiment of a voltage phase shift device formed by a single-phase transformer and a phase shift changeover switch, FIGS. 14 and 15 are diagrams of an embodiment of a core for resistive material, and FIG. 16. FIG. 17 is an embodiment of the conductor core, and FIG. 18 is a diagram showing an example of the conductor core. Figure 19 is another example of a conductor core, Figure 20 is an example in which multiple conductors are formed into a rotor core, and Figure 21 is a connection between multiple conductors with a reinforcement material. FIG. 22 is a block diagram showing the configuration of automatic control. 1...Multi-stator induction motor 2.3...Rotor core 4...Rotor shaft 5...
Conductor 6,7...Short ring 8.8A~8C
...Rotor 9...Nonmagnetic core 10.11...Side part 12...Ventilation barrel 13...Cooling body
13A... Cooling wing body 14... Machine frame 15
．． 16... Bearing plate 17... Connecting rod 18.
... Nut 19.20 ... Cooling impeller 21 ... Bearing 22.23 ... Winding wire 25 ... Second stator 2
6...Sliding @ 27...Fixing ring 28.
...Stop ring 29...Drive device 3o...Rotating mechanism 31...Rotating stator 32...Magnetic sensor 33...Gears 34.34a to 34Q...
・Magnetic detector 35... Small motor 36... Drive gear 37... Opening 38... Solenoid 39... Ventilation hole 40... Ventilation hole 41
...Nonmagnetic plate 42...Voltage phase difference detector 4
3...Display device 44...Speed detector 66.
...Space part 67...Ventilation barrel 68...Blower port 69...Ventil exhaust lower 0...Blower III
71...Windmill 72...Motor
73...Blower device 74A...Air intake port 74B
...Exhaust port part 75...Control device @ 76...
Input/output circuit 77...Control circuit-78...Arithmetic circuit 7
9... Memory circuit 80... Temperature detector 81.
・Keyboard 82 ・Start switch 84 ・・
・Resistance material core 84A... Opening window 85... Conductor core 85A... Wing body 85B... Arm
85C... Opening window 86A, 86B... Core for conductor 86 G-... Wing piece 87... Core for rotor 9
0.91...Stator 92A, 92B, 93A, 93B
...Winding 94.95...Stator 96.97...
- Winding 100... Voltage phase shifter 101. . . . Water tank 102 . . . Pump 103 . . Radiator 104 .
108D...Indication lamp 110.111...Stator 112.113...Winding 114...Single-phase transformer 1
15... Voltage phase difference setter 116... High resistance ring 1
17.118...Winding 119...First stator 12
0... Voltage phase difference setter M1-M4... Changeover switch N1-N4... Changeover switch P1-P4... Connection changeover switch

Claims (5)

[Claims] (1) A plurality of conductors installed in each of a plurality of rotor cores mounted on the same rotating shaft at arbitrary intervals are connected to form an integral rotor, and the plurality of conductors are connected to each other to form an integral rotor. The plurality of conductors are short-circuited and connected between the rotor cores using a resistive material, and a plurality of stators are disposed in parallel and facing each other concentrically with the plurality of rotor cores and on the outer periphery of the rotor cores. A voltage level for setting a starting phase difference and an operating phase difference in an electric motor provided with a voltage phase shift device in relation to at least one stator among the plurality of stators installed on the inner circumference. A phase difference setting device is connected to the voltage phase shifter, and a space is formed between the plurality of stators, between the plurality of rotor cores, and the machine frame in the ventilation shell, and the space is formed by the introduced outside air. A plurality of openings are opened in the machine frame to communicate with the ventilation shell, and the plurality of openings are connected to an arbitrary number of ventilation ports so as to cool and dissipate heat from the resistance material and exhaust the heat to the outside of the machine frame. 1. A cooling device for a multi-stator induction motor, characterized in that the cooling device is formed at an air exhaust port, and a blower is communicated with either the air blow port or the air exhaust port. (2) A cooling device for a multi-stator induction motor according to claim (1), wherein a space or a non-magnetic material is formed between the plurality of rotor cores. (3) Cooling of the multi-stator induction motor according to claim (1), wherein the starting phase difference is 180 degrees in electrical angle, and the operating phase difference is 0 degrees in electrical angle. Device. (4) A control mechanism for increasing/decreasing or on/off controlling the rotational speed of a motor provided in the blower device is provided, and the voltage phase setting device and the control mechanism are connected to a control device. A cooling device for a multiple stator induction motor according to item (1) or item (3). (5) Claims (1) or (3), wherein a control mechanism provided on the motor and a temperature detector disposed at any location on the ventilation barrel are connected to the control device. Cooling system for multiple stator induction motors.